Angular Framework

import { RuleWalker, IOptions } from 'tslint';
import { SourceFile, ClassDeclaration, Decorator, PropertyDeclaration, MethodDeclaration, BooleanLiteral } from 'typescript';
import { RawSourceMap } from 'source-map';

/**
 * Base walker class for traversing Angular AST structures
 * Provides Angular-specific node visiting capabilities
 */
export class NgWalker extends RuleWalker {
  constructor(
    sourceFile: SourceFile,
    options: IOptions,
    config?: NgWalkerConfig,
    metadataReader?: MetadataReader
  );

  /** Visit Angular component declarations */
  protected visitNgComponent(metadata: ComponentMetadata): void;
  /** Visit Angular directive declarations */
  protected visitNgDirective(metadata: DirectiveMetadata): void;
  /** Visit Angular pipe declarations */
  protected visitNgPipe(metadata: PipeMetadata): void;
  /** Visit Angular module declarations */
  protected visitNgModule(metadata: ModuleMetadata): void;
  /** Visit Angular injectable declarations */
  protected visitNgInjectable(metadata: InjectableMetadata): void;
  /** Visit class decorators */
  protected visitClassDecorator(decorator: ts.Decorator): void;
  /** Visit method decorators */
  protected visitMethodDecorator(decorator: ts.Decorator): void;
  /** Visit property decorators */
  protected visitPropertyDecorator(decorator: ts.Decorator): void;
  /** Visit host listener decorators */
  protected visitNgHostListener(method: ts.MethodDeclaration, decorator: ts.Decorator, args: string[]): void;
  /** Visit Input property decorators */
  protected visitNgInput(property: ts.PropertyDeclaration, input: ts.Decorator, args: string[]): void;
  /** Visit Output property decorators */
  protected visitNgOutput(property: ts.PropertyDeclaration, output: ts.Decorator, args: string[]): void;
  /** Visit HostBinding property decorators */
  protected visitNgHostBinding(property: ts.PropertyDeclaration, decorator: ts.Decorator, args: string[]): void;
  /** Visit ContentChild property decorators */
  protected visitNgContentChild(property: ts.PropertyDeclaration, input: ts.Decorator, args: string[]): void;
  /** Visit ContentChildren property decorators */
  protected visitNgContentChildren(property: ts.PropertyDeclaration, input: ts.Decorator, args: string[]): void;
  /** Visit ViewChild property decorators */
  protected visitNgViewChild(property: ts.PropertyDeclaration, input: ts.Decorator, args: string[]): void;
  /** Visit ViewChildren property decorators */
  protected visitNgViewChildren(property: ts.PropertyDeclaration, input: ts.Decorator, args: string[]): void;
}

interface NgWalkerConfig {
  cssVisitorCtrl?: CssAstVisitorCtrl;
  expressionVisitorCtrl?: RecursiveAngularExpressionVisitorCtr;
  templateVisitorCtrl?: TemplateAstVisitorCtr;
}

import { NgWalker } from 'codelyzer';

export class CustomAngularRule extends Lint.Rules.AbstractRule {
  apply(sourceFile: ts.SourceFile): Lint.RuleFailure[] {
    return this.applyWithWalker(new CustomWalker(sourceFile, this.getOptions()));
  }
}

class CustomWalker extends NgWalker {
  protected visitNgComponent(metadata: ComponentMetadata): void {
    // Custom component analysis logic
    if (metadata.selector.startsWith('custom-')) {
      // Validate custom component patterns
    }
    super.visitNgComponent(metadata);
  }
}

/**
 * Reads Angular decorator metadata from TypeScript class declarations
 * Extracts component, directive, pipe, and module information
 */
export class MetadataReader {
  constructor(fileResolver?: FileResolver);
  
  /** Read metadata from a class declaration */
  read(declaration: ts.ClassDeclaration): DirectiveMetadata | ComponentMetadata | PipeMetadata | InjectableMetadata | ModuleMetadata | undefined;
}

/**
 * Represents @Component decorator metadata
 */
export class ComponentMetadata extends DirectiveMetadata {
  constructor(
    readonly controller: ts.ClassDeclaration,
    readonly decorator: ts.Decorator,
    readonly selector?: string,
    readonly animations?: (AnimationMetadata | undefined)[],
    readonly styles?: (StyleMetadata | undefined)[],
    readonly template?: TemplateMetadata
  );
}

/**
 * Represents @Directive decorator metadata
 */
export class DirectiveMetadata {
  constructor(
    readonly controller: ts.ClassDeclaration,
    readonly decorator: ts.Decorator,
    readonly selector?: string
  );
}

/**
 * Represents @Pipe decorator metadata
 */
export class PipeMetadata {
  constructor(
    readonly controller: ts.ClassDeclaration,
    readonly decorator: ts.Decorator,
    readonly name?: string,
    readonly pure?: ts.BooleanLiteral
  );
}

/**
 * Represents @NgModule decorator metadata
 */
export class ModuleMetadata {
  constructor(
    readonly controller: ts.ClassDeclaration,
    readonly decorator: ts.Decorator
  );
}

/**
 * Represents @Injectable decorator metadata
 */
export class InjectableMetadata {
  constructor(
    readonly controller: ts.ClassDeclaration,
    readonly decorator: ts.Decorator,
    readonly providedIn?: string | ts.Expression
  );
}

/**
 * Represents component styles metadata
 */
export interface StyleMetadata extends PropertyMetadata {
  style: CodeWithSourceMap;
}

/**
 * Represents component template metadata
 */
export interface TemplateMetadata extends PropertyMetadata {
  template: CodeWithSourceMap;
}

/**
 * Represents component animation metadata
 */
export interface AnimationMetadata extends PropertyMetadata {
  animation: CodeWithSourceMap;
}

/**
 * Base property metadata interface
 */
export interface PropertyMetadata {
  node?: ts.Node;
  url?: string;
}

/**
 * Code with source map information
 */
export interface CodeWithSourceMap {
  code: string;
  map?: RawSourceMap;
  source?: string;
}

/**
 * Base visitor for Angular template AST traversal
 * Provides methods for visiting template nodes like elements, attributes, and expressions
 */
export class BasicTemplateAstVisitor {
  /** Visit template elements */
  visitElement(ast: ElementAst, context: any): any;
  /** Visit template attributes */
  visitAttr(ast: AttrAst, context: any): any;
  /** Visit bound properties */
  visitBoundText(ast: BoundTextAst, context: any): any;
  /** Visit text nodes */
  visitText(ast: TextAst, context: any): any;
  /** Visit directives */
  visitDirective(ast: DirectiveAst, context: any): any;
  /** Visit events */
  visitEvent(ast: BoundEventAst, context: any): any;
}

type TemplateAstVisitorCtr = new (...args: any[]) => BasicTemplateAstVisitor;

/**
 * Visitor for Angular template expressions
 * Analyzes property bindings, event handlers, and template expressions
 */
export class RecursiveAngularExpressionVisitor {
  /** Visit property read expressions */
  visitPropertyRead(ast: PropertyRead, context: any): any;
  /** Visit method call expressions */
  visitMethodCall(ast: MethodCall, context: any): any;
  /** Visit pipe expressions */
  visitPipe(ast: BindingPipe, context: any): any;
  /** Visit literal expressions */
  visitLiteralPrimitive(ast: LiteralPrimitive, context: any): any;
}

type RecursiveAngularExpressionVisitorCtr = new (...args: any[]) => RecursiveAngularExpressionVisitor;

/**
 * Collects template reference variables (#ref) and their usage
 * Useful for analyzing template variable scope and usage patterns
 */
export class ReferenceCollectorVisitor {
  /** Get all collected references */
  getReferences(): TemplateReference[];
}

interface TemplateReference {
  name: string;
  element: ElementAst;
  directive?: DirectiveAst;
}

/**
 * Base visitor for CSS AST traversal in Angular component styles
 * Analyzes stylesheets, rules, selectors, and properties
 */
export class BasicCssAstVisitor {
  /** Visit CSS stylesheet */
  visitCssStyleSheet(ast: CssStyleSheetAst, context?: any): any;
  /** Visit CSS rules */
  visitCssRule(ast: CssRuleAst, context?: any): any;
  /** Visit CSS selectors */
  visitCssSelector(ast: CssSelectorAst, context?: any): any;
  /** Visit CSS properties */
  visitCssProperty(ast: CssPropertyAst, context?: any): any;
}

type CssAstVisitorCtrl = new (...args: any[]) => BasicCssAstVisitor;

/**
 * CSS AST node types for component style analysis
 */
export interface CssAst {
  visit(visitor: CssAstVisitor, context?: any): any;
}

export interface CssStyleSheetAst extends CssAst {
  rules: CssRuleAst[];
}

export interface CssRuleAst extends CssAst {
  selector: CssSelectorAst;
  block: CssBlockAst;
}

export interface CssSelectorAst extends CssAst {
  selectorParts: CssSelectorPartAst[];
}

export interface CssPropertyAst extends CssAst {
  name: string;
  value: CssPropertyValueAst;
}

/**
 * Interface for resolving Angular template and style files
 */
export interface FileResolver {
  resolve(url: string, base?: string): string;
}

/**
 * Filesystem-based file resolver
 */
export class FsFileResolver implements FileResolver {
  resolve(url: string, base?: string): string;
}

/**
 * Mock file resolver for testing
 */
export class DummyFileResolver implements FileResolver {
  resolve(url: string, base?: string): string;
}

/**
 * Configuration interface for Angular analysis
 */
export interface Config {
  /** Predefined directive configuration */
  predefinedDirectives: DirectiveConfig[];
  /** Custom template parsing options */
  templateOptions?: TemplateParsingOptions;
}

interface DirectiveConfig {
  selector: string;
  exportAs?: string;
  inputs?: string[];
  outputs?: string[];
}

/**
 * Factory utilities for creating NgWalker instances
 */
export namespace ngWalkerFactoryUtils {
  /** Create default metadata reader */
  function defaultMetadataReader(): MetadataReader;
  /** Create configured NgWalker */
  function create(options: NgWalkerOptions): NgWalker;
}

/**
 * Template parsing utilities
 */
export function parseTemplate(
  template: string,
  templateUrl?: string,
  config?: Config
): TemplateAst[];

/**
 * CSS parsing utilities
 */
export function parseCss(
  css: string,
  url?: string
): CssStyleSheetAst;

import { NgWalker, ComponentMetadata } from 'codelyzer';

class MyCustomWalker extends NgWalker {
  protected visitNgComponent(metadata: ComponentMetadata): void {
    // Analyze component selector
    if (!metadata.selector.startsWith('app-')) {
      this.addFailureAtNode(
        metadata.controller,
        'Component selector must start with "app-"'
      );
    }

    // Analyze component template
    if (metadata.template && metadata.template.length > 1000) {
      this.addFailureAtNode(
        metadata.controller,
        'Component template is too large'
      );
    }

    super.visitNgComponent(metadata);
  }
}

import { BasicTemplateAstVisitor } from 'codelyzer';

class TemplateAnalyzer extends BasicTemplateAstVisitor {
  visitElement(ast: ElementAst, context: any): any {
    // Check for accessibility issues
    if (ast.name === 'img' && !this.hasAttribute(ast, 'alt')) {
      // Report missing alt attribute
    }
    
    return super.visitElement(ast, context);
  }

  private hasAttribute(element: ElementAst, name: string): boolean {
    return element.attrs.some(attr => attr.name === name);
  }
}